var zrUtil = require("zrender/lib/core/util");

var graphic = require("../../util/graphic");

var layoutUtil = require("../../util/layout");

var LegendView = require("./LegendView");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

/**
 * Separate legend and scrollable legend to reduce package size.
 */
var Group = graphic.Group;
var WH = ['width', 'height'];
var XY = ['x', 'y'];
var ScrollableLegendView = LegendView.extend({
  type: 'legend.scroll',
  newlineDisabled: true,
  init: function () {
    ScrollableLegendView.superCall(this, 'init');
    /**
     * @private
     * @type {number} For `scroll`.
     */

    this._currentIndex = 0;
    /**
     * @private
     * @type {module:zrender/container/Group}
     */

    this.group.add(this._containerGroup = new Group());

    this._containerGroup.add(this.getContentGroup());
    /**
     * @private
     * @type {module:zrender/container/Group}
     */


    this.group.add(this._controllerGroup = new Group());
    /**
     *
     * @private
     */

    this._showController;
  },

  /**
   * @override
   */
  resetInner: function () {
    ScrollableLegendView.superCall(this, 'resetInner');

    this._controllerGroup.removeAll();

    this._containerGroup.removeClipPath();

    this._containerGroup.__rectSize = null;
  },

  /**
   * @override
   */
  renderInner: function (itemAlign, legendModel, ecModel, api) {
    var me = this; // Render content items.

    ScrollableLegendView.superCall(this, 'renderInner', itemAlign, legendModel, ecModel, api);
    var controllerGroup = this._controllerGroup;
    var pageIconSize = legendModel.get('pageIconSize', true);

    if (!zrUtil.isArray(pageIconSize)) {
      pageIconSize = [pageIconSize, pageIconSize];
    }

    createPageButton('pagePrev', 0);
    var pageTextStyleModel = legendModel.getModel('pageTextStyle');
    controllerGroup.add(new graphic.Text({
      name: 'pageText',
      style: {
        textFill: pageTextStyleModel.getTextColor(),
        font: pageTextStyleModel.getFont(),
        textVerticalAlign: 'middle',
        textAlign: 'center'
      },
      silent: true
    }));
    createPageButton('pageNext', 1);

    function createPageButton(name, iconIdx) {
      var pageDataIndexName = name + 'DataIndex';
      var icon = graphic.createIcon(legendModel.get('pageIcons', true)[legendModel.getOrient().name][iconIdx], {
        // Buttons will be created in each render, so we do not need
        // to worry about avoiding using legendModel kept in scope.
        onclick: zrUtil.bind(me._pageGo, me, pageDataIndexName, legendModel, api)
      }, {
        x: -pageIconSize[0] / 2,
        y: -pageIconSize[1] / 2,
        width: pageIconSize[0],
        height: pageIconSize[1]
      });
      icon.name = name;
      controllerGroup.add(icon);
    }
  },

  /**
   * @override
   */
  layoutInner: function (legendModel, itemAlign, maxSize) {
    var contentGroup = this.getContentGroup();
    var containerGroup = this._containerGroup;
    var controllerGroup = this._controllerGroup;
    var orientIdx = legendModel.getOrient().index;
    var wh = WH[orientIdx];
    var hw = WH[1 - orientIdx];
    var yx = XY[1 - orientIdx]; // Place items in contentGroup.

    layoutUtil.box(legendModel.get('orient'), contentGroup, legendModel.get('itemGap'), !orientIdx ? null : maxSize.width, orientIdx ? null : maxSize.height);
    layoutUtil.box( // Buttons in controller are layout always horizontally.
    'horizontal', controllerGroup, legendModel.get('pageButtonItemGap', true));
    var contentRect = contentGroup.getBoundingRect();
    var controllerRect = controllerGroup.getBoundingRect();
    var showController = this._showController = contentRect[wh] > maxSize[wh];
    var contentPos = [-contentRect.x, -contentRect.y]; // Remain contentPos when scroll animation perfroming.

    contentPos[orientIdx] = contentGroup.position[orientIdx]; // Layout container group based on 0.

    var containerPos = [0, 0];
    var controllerPos = [-controllerRect.x, -controllerRect.y];
    var pageButtonGap = zrUtil.retrieve2(legendModel.get('pageButtonGap', true), legendModel.get('itemGap', true)); // Place containerGroup and controllerGroup and contentGroup.

    if (showController) {
      var pageButtonPosition = legendModel.get('pageButtonPosition', true); // controller is on the right / bottom.

      if (pageButtonPosition === 'end') {
        controllerPos[orientIdx] += maxSize[wh] - controllerRect[wh];
      } // controller is on the left / top.
      else {
          containerPos[orientIdx] += controllerRect[wh] + pageButtonGap;
        }
    } // Always align controller to content as 'middle'.


    controllerPos[1 - orientIdx] += contentRect[hw] / 2 - controllerRect[hw] / 2;
    contentGroup.attr('position', contentPos);
    containerGroup.attr('position', containerPos);
    controllerGroup.attr('position', controllerPos); // Calculate `mainRect` and set `clipPath`.
    // mainRect should not be calculated by `this.group.getBoundingRect()`
    // for sake of the overflow.

    var mainRect = this.group.getBoundingRect();
    var mainRect = {
      x: 0,
      y: 0
    }; // Consider content may be overflow (should be clipped).

    mainRect[wh] = showController ? maxSize[wh] : contentRect[wh];
    mainRect[hw] = Math.max(contentRect[hw], controllerRect[hw]); // `containerRect[yx] + containerPos[1 - orientIdx]` is 0.

    mainRect[yx] = Math.min(0, controllerRect[yx] + controllerPos[1 - orientIdx]);
    containerGroup.__rectSize = maxSize[wh];

    if (showController) {
      var clipShape = {
        x: 0,
        y: 0
      };
      clipShape[wh] = Math.max(maxSize[wh] - controllerRect[wh] - pageButtonGap, 0);
      clipShape[hw] = mainRect[hw];
      containerGroup.setClipPath(new graphic.Rect({
        shape: clipShape
      })); // Consider content may be larger than container, container rect
      // can not be obtained from `containerGroup.getBoundingRect()`.

      containerGroup.__rectSize = clipShape[wh];
    } else {
      // Do not remove or ignore controller. Keep them set as place holders.
      controllerGroup.eachChild(function (child) {
        child.attr({
          invisible: true,
          silent: true
        });
      });
    } // Content translate animation.


    var pageInfo = this._getPageInfo(legendModel);

    pageInfo.pageIndex != null && graphic.updateProps(contentGroup, {
      position: pageInfo.contentPosition
    }, // When switch from "show controller" to "not show controller", view should be
    // updated immediately without animation, otherwise causes weird efffect.
    showController ? legendModel : false);

    this._updatePageInfoView(legendModel, pageInfo);

    return mainRect;
  },
  _pageGo: function (to, legendModel, api) {
    var scrollDataIndex = this._getPageInfo(legendModel)[to];

    scrollDataIndex != null && api.dispatchAction({
      type: 'legendScroll',
      scrollDataIndex: scrollDataIndex,
      legendId: legendModel.id
    });
  },
  _updatePageInfoView: function (legendModel, pageInfo) {
    var controllerGroup = this._controllerGroup;
    zrUtil.each(['pagePrev', 'pageNext'], function (name) {
      var canJump = pageInfo[name + 'DataIndex'] != null;
      var icon = controllerGroup.childOfName(name);

      if (icon) {
        icon.setStyle('fill', canJump ? legendModel.get('pageIconColor', true) : legendModel.get('pageIconInactiveColor', true));
        icon.cursor = canJump ? 'pointer' : 'default';
      }
    });
    var pageText = controllerGroup.childOfName('pageText');
    var pageFormatter = legendModel.get('pageFormatter');
    var pageIndex = pageInfo.pageIndex;
    var current = pageIndex != null ? pageIndex + 1 : 0;
    var total = pageInfo.pageCount;
    pageText && pageFormatter && pageText.setStyle('text', zrUtil.isString(pageFormatter) ? pageFormatter.replace('{current}', current).replace('{total}', total) : pageFormatter({
      current: current,
      total: total
    }));
  },

  /**
   * @param {module:echarts/model/Model} legendModel
   * @return {Object} {
   *  contentPosition: Array.<number>, null when data item not found.
   *  pageIndex: number, null when data item not found.
   *  pageCount: number, always be a number, can be 0.
   *  pagePrevDataIndex: number, null when no next page.
   *  pageNextDataIndex: number, null when no previous page.
   * }
   */
  _getPageInfo: function (legendModel) {
    // Align left or top by the current dataIndex.
    var currDataIndex = legendModel.get('scrollDataIndex', true);
    var contentGroup = this.getContentGroup();
    var contentRect = contentGroup.getBoundingRect();
    var containerRectSize = this._containerGroup.__rectSize;
    var orientIdx = legendModel.getOrient().index;
    var wh = WH[orientIdx];
    var hw = WH[1 - orientIdx];
    var xy = XY[orientIdx];
    var contentPos = contentGroup.position.slice();
    var pageIndex;
    var pagePrevDataIndex;
    var pageNextDataIndex;
    var targetItemGroup;

    if (this._showController) {
      contentGroup.eachChild(function (child) {
        if (child.__legendDataIndex === currDataIndex) {
          targetItemGroup = child;
        }
      });
    } else {
      targetItemGroup = contentGroup.childAt(0);
    }

    var pageCount = containerRectSize ? Math.ceil(contentRect[wh] / containerRectSize) : 0;

    if (targetItemGroup) {
      var itemRect = targetItemGroup.getBoundingRect();
      var itemLoc = targetItemGroup.position[orientIdx] + itemRect[xy];
      contentPos[orientIdx] = -itemLoc - contentRect[xy];
      pageIndex = Math.floor(pageCount * (itemLoc + itemRect[xy] + containerRectSize / 2) / contentRect[wh]);
      pageIndex = contentRect[wh] && pageCount ? Math.max(0, Math.min(pageCount - 1, pageIndex)) : -1;
      var winRect = {
        x: 0,
        y: 0
      };
      winRect[wh] = containerRectSize;
      winRect[hw] = contentRect[hw];
      winRect[xy] = -contentPos[orientIdx] - contentRect[xy];
      var startIdx;
      var children = contentGroup.children();
      contentGroup.eachChild(function (child, index) {
        var itemRect = getItemRect(child);

        if (itemRect.intersect(winRect)) {
          startIdx == null && (startIdx = index); // It is user-friendly that the last item shown in the
          // current window is shown at the begining of next window.

          pageNextDataIndex = child.__legendDataIndex;
        } // If the last item is shown entirely, no next page.


        if (index === children.length - 1 && itemRect[xy] + itemRect[wh] <= winRect[xy] + winRect[wh]) {
          pageNextDataIndex = null;
        }
      }); // Always align based on the left/top most item, so the left/top most
      // item in the previous window is needed to be found here.

      if (startIdx != null) {
        var startItem = children[startIdx];
        var startRect = getItemRect(startItem);
        winRect[xy] = startRect[xy] + startRect[wh] - winRect[wh]; // If the first item is shown entirely, no previous page.

        if (startIdx <= 0 && startRect[xy] >= winRect[xy]) {
          pagePrevDataIndex = null;
        } else {
          while (startIdx > 0 && getItemRect(children[startIdx - 1]).intersect(winRect)) {
            startIdx--;
          }

          pagePrevDataIndex = children[startIdx].__legendDataIndex;
        }
      }
    }

    return {
      contentPosition: contentPos,
      pageIndex: pageIndex,
      pageCount: pageCount,
      pagePrevDataIndex: pagePrevDataIndex,
      pageNextDataIndex: pageNextDataIndex
    };

    function getItemRect(el) {
      var itemRect = el.getBoundingRect().clone();
      itemRect[xy] += el.position[orientIdx];
      return itemRect;
    }
  }
});
var _default = ScrollableLegendView;
module.exports = _default;